<template>
  <div>
    <el-form label-width="100px" size="small" @submit.native.prevent>
      <el-form-item>
        <template #label>
          <span>
            流转类型
            <el-tooltip placement="top">
              <template #content>
                <div>
                  普通流转路径：流程执行过程中，一个元素被访问后，会沿着其所有出口顺序流继续执行。
                  <br />默认流转路径：只有当没有其他顺序流可以选择时，才会选择默认顺序流作为活动的出口顺序流。流程会忽略默认顺序流上的条件。
                  <br />条件流转路径：是计算其每个出口顺序流上的条件。当条件计算为true时，选择该出口顺序流。如果该方法选择了多条顺序流，则会生成多个执行，流程会以并行方式继续。
                </div>
              </template>
              <el-icon><QuestionFilled /></el-icon>
            </el-tooltip>
          </span>
        </template>
        <el-select v-model="bpmnFormData.type" @change="updateFlowType">
          <el-option label="普通流转路径" value="normal" />
          <el-option label="默认流转路径" value="default" />
          <el-option label="条件流转路径" value="condition" />
        </el-select>
      </el-form-item>
      <el-form-item label="条件格式" v-if="bpmnFormData.type === 'condition'" key="condition">
        <el-select v-model="bpmnFormData.conditionType">
          <el-option label="表达式" value="expression" />
          <el-option label="脚本" value="script" />
        </el-select>
      </el-form-item>
      <el-form-item label="表达式" v-if="bpmnFormData.conditionType && bpmnFormData.conditionType === 'expression'" key="express">
        <el-input v-model="bpmnFormData.body" clearable @change="updateFlowCondition" />
      </el-form-item>
      <template v-if="bpmnFormData.conditionType && bpmnFormData.conditionType === 'script'">
        <el-form-item label="脚本语言" key="language">
          <el-input v-model="bpmnFormData.language" clearable @change="updateFlowCondition" />
        </el-form-item>
        <el-form-item label="脚本类型" key="scriptType">
          <el-select v-model="bpmnFormData.scriptType">
            <el-option label="内联脚本" value="inlineScript" />
            <el-option label="外部脚本" value="externalScript" />
          </el-select>
        </el-form-item>
        <el-form-item label="脚本" v-if="bpmnFormData.scriptType === 'inlineScript'" key="body">
          <el-input v-model="bpmnFormData.body" type="textarea" clearable @change="updateFlowCondition" />
        </el-form-item>
        <el-form-item label="资源地址" v-if="bpmnFormData.scriptType === 'externalScript'" key="resource">
          <el-input v-model="bpmnFormData.resource" clearable @change="updateFlowCondition" />
        </el-form-item>
      </template>
    </el-form>
  </div>
</template>

<script setup>
import { ref, reactive, watch, getCurrentInstance } from 'vue';
import { QuestionFilled } from '@element-plus/icons-vue';
import { StrUtil } from "@/utils/StrUtil";

// 属性定义
const props = defineProps({
  id: {
    type: String,
    required: true
  }
});

// 注入modelerStore
// const modelerStore = inject('modelerStore');
const { proxy } = getCurrentInstance();
const modelerStore = proxy.modelerStore;

// 状态定义
const bpmnFormData = reactive({
  body: null
});
const bpmnElementSource = ref({});
const bpmnElementSourceRef = ref({});

// 重置流程条件
const resetFlowCondition = () => {
  bpmnFormData.body = null;
  bpmnElementSource.value = modelerStore.element.source;
  bpmnElementSourceRef.value = modelerStore.element.businessObject.sourceRef;
  
  if (bpmnElementSourceRef.value && bpmnElementSourceRef.value.default && bpmnElementSourceRef.value.default.id === modelerStore.element.id) {
    // 默认
    bpmnFormData.type = "default";
  } else if (!modelerStore.element.businessObject.conditionExpression) {
    // 普通
    bpmnFormData.type = "normal";
  } else {
    // 带条件
    const conditionExpression = modelerStore.element.businessObject.conditionExpression;
    Object.assign(bpmnFormData, conditionExpression, { type: "condition" });
    
    // resource 可直接标识 是否是外部资源脚本
    if (bpmnFormData.resource) {
      bpmnFormData.conditionType = "script";
      bpmnFormData.scriptType = "externalScript";
      return;
    }
    
    if (conditionExpression.language) {
      bpmnFormData.conditionType = "script";
      bpmnFormData.scriptType = "inlineScript";
      return;
    }
    
    bpmnFormData.conditionType = "expression";
  }
};

// 更新流转类型
const updateFlowType = (flowType) => {
  // 正常条件类
  if (flowType === "condition") {
    const flowConditionRef = modelerStore.moddle.create("bpmn:FormalExpression");
    modelerStore.modeling.updateProperties(modelerStore.element, {
      conditionExpression: flowConditionRef
    });
    return;
  }
  
  // 默认路径
  if (flowType === "default") {
    modelerStore.modeling.updateProperties(modelerStore.element, {
      conditionExpression: null
    });
    modelerStore.modeling.updateProperties(bpmnElementSource.value, {
      default: modelerStore.element
    });
    // 清空条件格式
    bpmnFormData.conditionType = null;
    return;
  }
  
  // 清空条件格式
  bpmnFormData.conditionType = null;
  // 正常路径，如果来源节点的默认路径是当前连线时，清除父元素的默认路径配置
  if (bpmnElementSourceRef.value.default && bpmnElementSourceRef.value.default.id === modelerStore.element.id) {
    modelerStore.modeling.updateProperties(bpmnElementSource.value, {
      default: null
    });
  }
  
  modelerStore.modeling.updateProperties(modelerStore.element, {
    conditionExpression: null
  });
};

// 更新流程条件
const updateFlowCondition = () => {
  let { conditionType, scriptType, body, resource, language } = bpmnFormData;
  let condition;
  
  if (conditionType === "expression") {
    condition = modelerStore.moddle.create("bpmn:FormalExpression", { body });
  } else {
    if (scriptType === "inlineScript") {
      condition = modelerStore.moddle.create("bpmn:FormalExpression", { body, language });
      bpmnFormData.resource = "";
    } else {
      bpmnFormData.body = "";
      condition = modelerStore.moddle.create("bpmn:FormalExpression", { resource, language });
    }
  }
  
  modelerStore.modeling.updateProperties(modelerStore.element, { conditionExpression: condition });
};

// 监听ID变化重置表单
watch(() => props.id, (newVal) => {
  if (StrUtil.isNotBlank(newVal)) {
    resetFlowCondition();
  }
}, { immediate: true });
</script>
